Bump main to 5.0.0~pre1

[chapulina]

Branch ign-common4 has been created for the Edifice release and 4.0.0 released from that.

The main branch now corresponds to version 5.0.0~pre1, and nightlies will soon be created from this branch.

gazebo-tooling/release-tools#421

[codecov]

Codecov Report

Merging #193 (03d428b) into main (2f2b229) will not change coverage.
The diff coverage is n/a.

❗ Current head 03d428b differs from pull request most recent head 69d27bb. Consider uploading reports for the commit 69d27bb to get more accurate results

@@           Coverage Diff           @@
##             main     #193   +/-   ##
=======================================
  Coverage   75.48%   75.48%           
=======================================
  Files          73       73           
  Lines       10349    10349           
=======================================
  Hits         7812     7812           
  Misses       2537     2537           

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